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PDF4QT vs Stirling PDF: catalog facts
PDF4QT	Stirling PDF
Free Free and open source; donations are accepted through GitHub Sponsors.	Freemium Free plan is $0/month with no card required (60+ tools, web/desktop/self-hosted, 500…
Windows, Linux, Command line	Windows, macOS, Linux, Web, Self-hosted
Viewing and editing applications in one project Command-line tool for scripted PDF work	55+ PDF tools covering signing, converting, merging, editing, OCR and redaction, chained in a stateful workspace with… Runs on Docker, bare metal, Kubernetes or as native desktop apps for Windows, macOS and Linux
No macOS version Mostly the work of a single principal developer	Open-core: SSO, external database, Google Drive integration, SAML and audit logs are gated behind paid Team or… Manual server setup needs Java 25+ plus LibreOffice and Tesseract for conversions and OCR
Downloadable app	Self-hosted, Downloadable app, Web application, Hosted service
Open source	Open source
License: MIT	License: MIT
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked September 20, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.